Abstract
A series of three ansa-titanocene monochlorides containing η 5-tetramethylcyclopentadienyl ligands bridged by five- or eight-membered aliphatic chains were prepared via reduction of the corresponding dichlorides with half molar equivalent of magnesium and characterized by spectral methods. The solid-state structures of the monochloride complexes ansa-[TiCl{η 5:η 5-C 5Me 4CH(Me)CH 2CH 2CH(Me)CH(Me)C 5Me 4}] ( 1a) and ansa-[TiCl{η 5:η 5-C 5Me 4(CH 2) 3CH(Me)CH(Me)CHCHCH 2C 5Me 4}] ( 4a), and of the bridge-unsaturated titanocene dichloride complex ansa-[TiCl 2{η 5:η 5-C 5Me 4CH 2CHCH(CH 2) 5C 5Me 4}] ( 3) were determined by single-crystal X-ray diffraction. All the compounds show bent metallocene structures with the ansa-chain situated in a side position with respect to Cg, Ti, Cg (Cg=centroid of the cyclopentadienyl ligand) plane. Angles subtended by the least-squares planes of the cyclopentadienyl rings and conformation of the ansa-chains indicates the absence of steric strain in the metallocene framework.
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